Rotary cut-off valve.



PATBNTED MR'. 28, 1903i,

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f77/Ue f W@ (M W( i il Illl W. J. FRANGKE.

. ROTARY GUT-OFP VALVE.

APPLICATION FILED NOV. 15, 1902.

w J fm? No.` 726,419. PATENTED APR. 28, 1903.

, W. J. PRANCKE. ROTARY GUT-OFP VALVE.

APPLIUATION FILED Nov. 15, 1902. No MODEL. v a SHEETS-SHEET z,

z 1 Il PATENTED APR. 28, 19043..`

W. J. FRANGKE.. ROTARY GUT-OFF VALVE.

APPLIOATION FILED Nov.1s, 1902.

3 SHEETB--SHEET 3.

l0 MODEL.

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VILLIAM J. FRANOKE, OF NEW BRUNSWICK, NEW JERSEY.

ROTARY CUT-OFF VALVE.'

SPECIFICATION forming part of Letters` PatentNo. 726,419, dated April 28, 19031.

Application filed November l5, 1902. Serial No. 131,473. (No model.)

To @ZZ whom may concern:

Be itknown that I, WILLIAM J. FRANCKE, a citizenof the United States, residing in New Brunswick, in the State of New Jersey, have invented certain new and useful Improvements in Rotary Cut-Off Valves, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to valves which rotate continuously in one direction and are therefore particularly adapted for use in connection with high-speed engines.

The general object of the invention is to improve the construction of valves of this class so that they shall operate more satisfactorily at very high speed'and shall be capable of easy regulation or adjustment to meet varied conditions of use. In a valve constructed in accordance with the invention the cut-off can be changed without changing the lead and the cut-off, the lead, the release, and the compression can each be changed independently of the others. Furthermore, the parts are so constructed and related that the y valve is practically a balanced valve.

Other features of the improved valve will be pointed out more particularly hereinafter with reference to the accompanying drawings, in which the invention is illustrated in different embodiments.

In the drawings, Figure 1 is a vertical central section of a two-cylinder single-acting engine to which the improved valve is applied. Fig. 2 is a vertical central section on a plane at right angles to that of Fig. 1. Fig. 3 is a horizontal section on the irregular plane indicated by the line 3 3 of Figs. l and 2. Fig. l is a view similar to Fig. l, but illustrating the application of the valve to a single-cylinder double-acting engine. Figs. 5 and are sections on the planes indicated by the lines 5 5 and 6 6, respectively, of Fig. 4. Fig. 7 is a vertical central section showing on the same scale the outer shell or casing and the fixed sleeve shown in Fig. 4, the plane of the section being at right angles to the plane of section of Fig. 4t.

Although the present invention is not concerned with the particular construction of the engine with which it is employed, so much of the engine as is necessary to enable the application of the invention to be clearly understood is shown in Figs. l, 2, and 3. VIn the structure there represented the crankshaft A, mounted in suitable bearings, has coupled to its cranks two single-acting trunkpistons B, which reciprocate in their respective cylinders C. Between the cylinders C is disposed the valve-gear common to both. The valve is actuated by a shaft mounted in suitable bearings in the frame or casing and driven continuously in one direction by bevelgears CZ from the crank-shaft A. One section D of the valve-shaft has no longitudinal movement, while the other section D is arranged to have longitudinal movement while rotating with the section D, an ordinary coupling (indicated at d') being provided to permit the longitudinal movement of one section, while insuring therotation of both sections together. The section D is arranged to be moved longitudinally by the engine-governor E,which may be of ordinary or preferred construction and need not be further described herein. As the valve,however,is exceedinglysensitive,it may be desirable in some cases to make the governor somewhat stiffer in action by making the balls e somewhat heavier than usual and by interposing between the movable governorhead e and the rotating but longitudinallyimmovable ring e2 one or more springs e3, to be overcome by the action of the balls as they respond to increased speed of the engine. The shaft-section D' has mounted thereon to rotate and to move longitudinally therewith a sleeve F, the connection between the sleeve and the shaft being effected in thecolnstruction shown in Figs. l, 2, and 3 by an arm f, and said sleeve is provided on one side with a supply-port f' and on the other side with an exhaust-channel f2. Within the rotating sleeve F is a non-rotating sleeve G, which in a tixed sleeve H, which is in effect a part of the shell or casing K and is provided with ports h and is in communication through its The cylinopen end h with the exhaust I.

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der supply and eXhaust port c is adapted for communication with the ports h.

In the operation of the form of the valve already described as applied to a two-'cylinder single-acting engine, as represented in Figs. l, 2, and 3 of the drawings, the steam enters the IiXed sleeve G through the steaminlet port g and passes thence through the portf' of the rotating sleeve F and the 0bliquely-disposed port h of the fixed sleeve H, which for convenience is formed independently of the valve shell orcasingK,into the port c of the cylinder C, behind the piston therein. As will be understood, the end ot' the sleeve G is closed and has a snug lit within the sleeve F and around the shaft D' or a bushing d2, which is interposed between the shaft and the sleeve. While steam is admitted to one cylinder, as just described, the exhaust-steam from the other cylinder passes through the port c and the port h of the sleeve H and the open end h' of the sleeve H to the exhaust-outlet I. As the sleeve F rotates with the shaftsection D' steam will be admitted through ports hand cbehind the piston the instant that the portf overlaps the end of the port g in the sleeve G, and the lead consequently will not be varied; but as the sleeve F is moved longitudinally by the action of the governor E the position of the port f with respect to the obliquely-disposed port h in the sleeve H will vary with the speed of the engine, so that the eut-off will be Varied, while the lead remains unchanged. The port gin the sleeve G is long enough to be overlapped by the portf' in whatever position the sleeve F may be, and as its position with respect to the port 71, is unchanged by the rotation of the sleeve F steam will always be admitted to the cylinder at the same point with relation to the position of the piston without regard to the shifting of the cut-off through the longitudinal movement of the sleeve F. The cutoft of course is always determined by the action of the governor. The lead can be determined to suit the requirements of the particular engine by rotating the sleeve F slightly forward or backward with reference to the crank-shaft and therefore with reference to the pistons, such rotation of the sleeve F being'permitted by loosening the set-screw cl3 by which the shaft .D is secured in the corresponding beveled gear d. Release and compression can also be determined for each engine by cutting away more or less one edge or the other of the exhaust-channel f2 in the sleeve F.

Although the valve has been shown and described as applied to a two-cylinder singleacting engine, it will be readily understood that with slight modification it can also be applied to a single-cylinder double-acting engine. Such an application of the Valve is represented in Figs. 4t, 5, 6, and 7. The principal change is in the arrangement of the parts to permit steam to be admitted to the central portion of the sleeve G and to be delivered therefrom to the opposite ends of the cylinder C alternately. To accomplish this, two sleeves F and F2, similar to the sleeve F in the construction previously described and similarly provided with ports f', but oppositely placed, are secured upon the shaftsection D. The sleeve G is likewise similar to the sleeve G of the construction previously described, but is provided at each end with a port g, each of its ports being inclined in the same direction as the corresponding port f of the corresponding sleeve F' and F2. Steam is admitted from the inlet g2 to the interior of the sleeve G' through the space between the two sleeves F' and F2 and a central port g2 in the sleeve G'. The sleeve G' in this instance is permitted to reciprocate with the sleeves F and F2, in which it is held; but, as before, it is held from rotation in this instance by a pin 7o in the valve shell or casing K', which engages a longitudinallygrooved lug g4 on the sleeve G'. The sleeve H', which in this instance also is formed independently ofthe shell K', for convenience in manufacture is provided with two obliquelydisposed ports h' and h2, corresponding, respectively, with the ports c' and c2 of the cylinder C'. Exhaust-ports h3 and h4 communicate through a channel h5, having common exhaust-outlet I'.

The operation of the improved valve in the application thereof last described is substantially the same as in the construction first described herein. The steam from the inlet g2 enters the inner sleeve G' through the space between the sleeves F and F2 and the port g2 and passes thence in the position of the parts represented in Fig. 4 through the port g, the port f' of the sleeve F', and the port 72,' of the sleeve H' into the cylinder through the port c. At the same time the exhaust-steam from the other end of the cylinder passes through the port c2 in the cylinder-wall, the port h2 in the sleeve H', and the exhaust-channel f4 in the sleeve F2 into the space between the end of the sleeve F2 and the head of the shell, from which it escapes through the port h4 and the channel h5 to the outlet I. The rotation of the sleeves F and F2 with respect to the ports g in the non-rotating sleeve G and the ports h' and h2 in the non-rotating sleeve H' insures the initial admission of steam to the cylinder at the same point with respect to the position of the piston therein, so that the lead remains the same under all conditions; but the longitudinal movements of the sleeves F' and F2 under the action of the governor causes the cut-off to be varied with the varying speed of the governor. The regulation of lead, compression, and release may be effected independently in each case in the same manner as already described with respect to the construction shown in Figs. 1, 2, and 3.

It will be obvious that many changes in construction and relation of parts, particu- IOO IIO

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larly with reference to different applications ot the valve, may be made without departing from the spirit of the invention.

l claim as my inventionl. A valve for steam-engines, comprising a sleeve provided with a port for the passage of steam, means to rotate said sleeve, means to move said sleeve longitudinally as the speed of the engine varies, a non-rotating sleeve Within said rotating sleeve communicating with the steam-inlet and having a port to cooperate with the port in the rotating sleeve, and a sleeve outside oithe rotating sleeve and having a port for the passage of steam to the engine, substantially asdescribed.

2. A Valve for Steamengines, comprising a sleeve provided with a port for the passage of steam, means to rotate said sleeve, means to move said sleeve longitudinally as the speed of the engine varies, a non-rotating sleeve within `said rotating sleeve f communicating with the steam-inlet and having a port to cooperate with the port in the rotating" sleeve, and a sleeve outside of the rotating sleeve and having a port for the passage of steam to and from the engine, said rotating sleeve also having an exhaust-channel in communication with the exhaust-outlet, substantially as described.

3. A valve for steam-engines, comprising a shaft, means to rotate saidshaft, means to move said shaft longitudinally as the speed of the engine varies, a sleeve mounted upon said shaft to rotate and to move longitudinally therewith, a non-rotating sleeve within the first-named sleeve, communicating with the steam-inlet and having a port to cooperate move said shaft longitudinally as the speed.

of the engine varies, a non-rotating sleeve in communication with the steam-inlet and having a port, a sleeve outside of the iirst-named sleeve and secured 4to said shaft to move therewith, said sleeve having a port for the passage of steam and an exhaust -channeh and a third sleeve outside of the last-named sleeve and having a port for the passage of steam to and from the engine, substantially as described.

5. A valver for steam-engines, comprising a shellmor casing, a sleeve fixed to said shell or casing, said sleeve having an inlet-port and a port for the passage of steam, a second sleeve mounted upon the first-named sleeve and having a port, means to rotate said sleeve,

and means to move said sleeve longitudinally as the speed of the engine varies, substantially as described.

6. A valve for steam-engines, comprising a shell or casing, a sleeve fixed to said shell or casing, said sleeve having an inlet-port and a port for the passage of steam, a second sleeve mounted upon the iirst-named sleeve, means to rotate the last-named sleeve, and means to move the lastnamed sleeve l0ngitudinally as the speed of the engine varies, said shell or casing having an obliquely-disposed port to cooperate with the port in the rotating sleeve for the passage of steam to the engine, substantially as described.V

7. A valve for steam-engines, comprising a shell or casing having a port for the passage of steam to the engine, a sleeve xed with relation to said shell or casing, said sleeve having an inlet-port and a port for the passage of steam, a second sleeve mounted'upon the rst-named sleeve, means to rotate the last-named sleeve, and means to move said last-named sleeve longitudinally as the speed of the engine varies, said last-named sleeve having a port to cooperate with the ports in the iXed sleeve and in the shell or casing, and having an exhaust-channel in communication with the exhaust-outlet to cooperate with the port in said shell or casing, substantially as described.

S. A valve for steam-engines, comprising'a shell or casing, a sleeve fixed to said shell or casing, said sleeve having an inlet and a port for the passage of steam, a shaft mounted to rotate and to move longitudinally within said sleeve and a second sleeve mounted upon the first-named sleeve and connected to said shaft to move therewith, said second sleeve having a portto cooperate with the port in the iirstnamed sleeve, substantially as described.

9. A valve for steam-engines, 'comprising a shell or casing having an obliquely-disposed port, a sleeve fixed to said shell or casing, said sleeve having an inlet and a port for the passage of steam, a shaft mounted to rotate and to move longitudinally within said sleeve, and a second sleeve interposed between the rstnamed sleeve and the shell creasing and having a port for the passage of steam yand connected to said shaft to move 'therewith, substantially as described.

Thislspecification signed and witnessed this 11th day of November, A. D.`l902.`

WILLIAM i J. FRANCKE.

In presence of ANTHONY N. JnsnnnA, M. A. BRAYLEY.

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